Cisco ONS 15454 SDH Specifications download pdf (Page 482)

Glossary

GL-20

Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

SSM

(Synchronous Status Messaging). A SONET protocol that communicates information about the quality of the timing source

using the S1 byte of the line overhead.

STA

(Spanning-Tree Algorithm). An algorithm used by the spanning tree protocol to create a spanning tree. See also Spanning tree

and STP.

Standby card

A card that is not active or carrying traffic. A standby card can be a protect card or, after a protection switch, a working card

can be a standby card.

Static route

A route that is manually entered into a routing table. Static routes take precedence over routes chosen by all dynamic routing

protocols.

STP

1. Shielded Twisted Pair.

2. 2. Spanning Tree Protocol. Bridge protocol that uses the spanning-tree algorithm to enable a learning bridge to dynamically

work around loops in a network topology by creating a spanning tree. See also Spanning tree and STA.

STS

(Synchronous Transport Signal, used generically when speaking of SONET signals.)

STS-1

(Synchronous Transport Signal Level 1). Basic building block signal of SONET, operating at 51.84 Mbps for transmission over

OC-1 fiber. Faster SONET rates are defined as STS-n, where n is a multiple of 51.84 Mbps. See also SONET.

Subnet mask

32-bit address mask used in IP to indicate the bits of an IP address that are used for the subnet address. Sometimes referred to

simply as mask. See also IP address mask and IP address.

Subnetwork

In IP networks, a network confined to a particular subnet address. Subnetworks are networks segmented by a network

administrator in order to provide a multilevel, hierarchical routing structure while shielding the subnetwork from the addressing

complexity of attached networks. Sometimes called a subnet.

Subtending rings

SONET rings that incorporate nodes that are also part of an adjacent SONET ring.

Superuser

A security level that can perform all of the functions of the other security levels as well as set names, passwords, and security

levels for other users. A superuser is usually the network element administrator. See also Retrieve user, Maintenance user, and

Provisioning user.

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Cisco ONS 15454 SDH Specifications Page 482